Tumbler lock



June 19, 1928.

E., N JACCJB! TUMBLER LOCK Filed Dec. 23, 1925 gfij eetsfiheet I INVENTOR 1?. I 03% I. u

ATTOIQN Y WITNESSES [A Q Wart/M QQX E. N. JACOB] June 19, 1928.

TUMBLER LOCK 2 Sheets-Sheet Filed Dec. 23, 1925 R (TOMA/q W WITNESSES INVENTOR I Q r a ATTORNEY Patented June 19, 1928.

UNITED STATES PATENT orF cE.

EDWARD N. JACOBI, OF MIIJWAUKEE, WISCONSIN, ASSIGNOR T0 BRIGGS '& STBATTON CORPORATION, OF MILWAUKEE, WISCONSIN, A CORPORATION OF DELAWARE.

TUMBLER LOCK.

Application filed December 23, 1925. Serial No. 77,295.

This invention has for its object to provide a tumbler lock in which the lock barrel enters the lock-case from the front and is confined in place by means of a metal cap turning therewith and having a sealing engagement with the lock-case that will effectually prevent tampering with the lock barrel.

Another object of the invention is to provide such a sealing cap of soft steel so as to render it of greater protection against damage.

Another object of the invention is to utilize the sealing connection of the lock pro- F tecting cap as a stop for limiting the turning movements of the lock barrel.

Another object of the invention is to simplify the conhtruction of locks of this character so as to render them inexpensive to manufacture and at the same time ditficult to damage in such a way as to obtain the useof the parts locked thereby.

lVith the above and other objects in View the invention consists in the look as herein claimed, its parts and combinations of parts and all equivalents.

Referring to the accompanying drawings, in which like characters of reference indicate similar parts in different views,

Fig. 1 is a central sectional view of one form oflock constructed in accordance with this invention;

Fig. 2 is a side elevation thereof;

Fig. 3 is a front view thereof;

Fig. 4 is a transversesectional view on the plane of line 4-4 of Fig. 1;

Fig. 5 is a similar view on the plane of line 5--5 of Fig. 1; v v

Fig. 6 is a view similar to Fig. 4 showing a modification wherein the sealing groove of the capis utilized for containing stop pins for limiting the turning of the lock barrel; Fi 7 is a longitudinal sectional view of a mo ified form of lock;

Fig. 8 is a plan view thereof partly sectioned;

Fig. 9 is a perspective longitudinal sectional view of the lock-case thereof, and

F1 10 is a perspective view of the'sealing cap iliereof.

In these drawings, 15 indicates a cylindrical lock-case in which is mounted to rotate or oscillate a lock barrel 16 having aand provided with transversely extending slide tumblers 19 adapted to engage grooves 20 in the walls of the lock-case when the key is removed but fitting the variously lengthened bits of the key so as to be withdrawn thereby when the keyis inserted to lie flush with the surface of the lock barrel and permit the lock barrel to be turned by means of the key. This lock barrel 16 is let into the lock-case from the front thereof and may or may not seat against a shoulder 21 formed in the lock-case. The annular groove 22 formed in the bore of the lockcase near the lower end thereof is to permit the longitudinal grooves 20 to be broached therein.

The lock barrel 16 may be made of a die casting as a convenient and inexpensive construction for obtaining uniformity and, as the alloy metal of suchdie castings is not suitable for withstanding attempts at muti lat-ion for access to or unauthorized use of the parts locked. a protecting sealing cap 23 is used, preferably of soft steel, as better resisting intentional damage than the harder metal. This cap is provided with a recess to fit over the upper end of the lock barrel and have a tight forced fit therewith soas to turn with the lock barrel, the lock-case being provided. with a counterbore 24 of larger diameter than the bore in which the lock barrel fits to receive the cap and form a bearing therewith to take the wear. The

sealing cap 23 is provided with a key-hole 25 registering with the key slot :17" of the lock barrel and to prevent the removal of the parts a tangent pin 26 is driven through an opening in the lock-case and through an annular groove 27 in the sealing cap so as to not interfere with the turning movements of the lock barrel and the cap by taking end thrust thereof. The edges of the opening in the lock-case through which the tangent pin 26 is driven are 'peened over the ends of the pin to prevent its removal.

The lock-case is secured in a suitable housing, not shown, by means-of a set screw entering an opening 28 in its side and the lock barrel 16 is rovicled with a cam slot 30 of a spring-pressed locking olt 31, which serves to lock the mechanism con trolled in any suitable manner, the turning of the lock barrel by means of the key serv- 1. :jection 29 at its ower end to enga e 1n :1

. its spring in a well known manner.

ing to move the bolt against the pressure of lized-as a space in which to contain a pair of stop pins 32, one of which "is driven through openings provided for it in the wall of the cap and in the lock barrel and the other is driven through an opening in the lock-case and both project into the groove 27 so as to come into engagement, in the position ofthe lock barrel in which the key may be removed although it is obvious that a similar stop may be provided for determining the other! position of the lock barrel.

In that formof the invention shown in Figs. 7 to 10 inclusive, the sealing cap is provided with its own means for looking it to the lock-case. vided with an annular flange 33 in its counterbore interrupted by the same broaching operation that produces. the tumbler grooves 20 and the sealing cap 23' fits within this flange and bears thereon, its lower end,"

however, being cut away to leave only the opposite pair of downwardly and outwardly extending hook-like locking lugs 34, as shown" in Fig. 10, which may be entered through the slots 20 and then turned into locking engagement with the flange 33. The

lock barrel 16' is also provided with a pair of oppositely positioned projecting locking lugs 35, which may also enter through the slot 20 and then turn into engagement beneath the flange 33, the spacing of the flange 33 from the shoulder 36 formed between the bore and the counterbore of the lock-case providing'an annular groove 37 to receive said locking lugs 34 and The sealing cap "23' in this construction also has a forced fit on the end of the lock barrel 16'. but in this instance these parts are forced together during the assembly. The lock barrel is entered in the lock-case, its locking lugs 35 passing through the slots 20 and then being turned into groove 37 to clear. the slots 20 for the reception of the lockinglugs '34 of the cap. The cap is then forced onto the end of the lock barrel, its lugs 34 entering through the slots 20 to the level ofthe groove 37. This latter operation is performed while a key is in place withdrawing the tumblers 19 and while the The lock-case 15 is prolock barrel is held thereby in the unlocking position of the look. When the key is then turned to the locking position of the lock so that it may be removed, both sets of locking lugs turn together in the groove 37 to the position shown in Figs. 7 and 8, where the lugs 35 of the lock barrel register with the slots 20.

'It will be seen that both the lugs 35 of the lock barrel and the lugs 34 of the steel can serve by their engagement with the flange33 to prevent the withdrawal of the cap and the lock barrel and that at such times as the mechanism is locked and the key is with drawn the stronger steel lugs 34 of the sealing cap are in looking engagement with said flange 33. At such times as the mechanism is unlocked with the key in place there will be no occasion for tampering with the lock and the engagement of the die cast lugs 35 of the lock barrel with the flange 33 will be adequate protection against the withdrawal of the parts.

- The lock structure controlled by the turning movements of the lock barrel may be of any type, but, as shown, a cam or wrist-pin ing cap not only retains the lock barrel in the lock-case, but protects it from being I tampered with and should an attempt be made to force it to a position for removal,- such attempt will be effectively prevented by the engagement of the lugs 34 thereoi. with the locking lugs 35 that block the slots. 20.

Any attempt at driving the sealing cap further would cause the rupture of the die cast lock barrel in the plane of one of the tumbler slides and so prevent access to the locked mechanism; I.

The vertical slot 41 in the side of the lockcase 15' is to receive a set-screw from the housing-in which said lock-case is slidably mounted to prevent the lock-case from turning What I claim as new and. desire to secure by Letters Patent is:

1. In a. lock, a lock-case having a bore opening at the front end thereof, a lock barrel fitting in said bore, a cap fitting on the end ofthe'lock barrel and in the end of the bore, and means for preventing removal of the cap.

2. In a look, a look-case having a here from the front end thereof, a lock barrel fitting in the bore, a cap secured enthe end of the lock barrel and fitting within the bore. and means for preventing the removal of the cap.

3. In a locle a lock-case having a bore at the front end thereof. a loel; barrel mounted in the bore. a rap fitting on the end of the lock barrel and loosely mounted in the end of the bore and forming a bearing therewith for the loek barrel. and means for preventing removal of the rap.

-1-.. In a look. a loele'aae having a bore with a eounterbore at the front end thereof, a lot-k barrel fitting iuthe bore, a cap fitting on the end of the lOt'k barrel and in the eounterbore, and means for. preventing the removal of the eap.

In a lock. a leek-case having a bore entering it from its front end with a counterlJUIt at the front end. a lock barrel fitting in the bore. a rap fitting on the end of the iUt'k barrel and fitting in the eouuterbore to form a bearing for the lock barrel. and meairs for preventing the removal of the cap.

(3. In a look. a lock-ease having a bore mitering it from its front end with a eouuter bore at such front end and an annular internal groove spaced from the eounterbore and provided with tumbler slots broached in the wall of the bore from the eounterlmre to the groove. a lock barrel fitting in the bore and provided with tumblers projecting into said tumbler slots, a 211) fitting on the end of the l0('l( barrel and within the eounterbore. and means for preventing the removal of the cap. I

T. In a lock. a lock-ease having a bore entering it from its front end with a counterbore atsaid front end. a 106k barrel fitting in the bore. a soft ateel eap fitting around the end of the lock barrel and within the eouuterbore. and means for preventing the removal of the eap.

8. In a look. a lock-ease having a bore entering it from its front end with a counterbore at the front end, a lock barrel fitting in the bore. a cap fitting on the end of the lock barrel and contained within the counterbore, there being a groove in the cap, and a pin passing through the wall of the lockcase and entering the groove for preventing withdrawal of the cap.

9. In a lock. a lock-ease having a bore entering it from its front end with a connterhere at the front end. a lock barrel fitting in the bore. a rap fitting on the end of the lock barrel and contained within the counterbore, there being a groove in the cap, and a tangentpin fitting in the wall of the lockcase and entering the groove for preventing the removal of the cap.

10. In a lock, a lock-case having a bore entering it from the front end with a eounterbore at the front end. a lock barrel fitting in the bore. a eap fitting on the end of the. lock barrel and eontained within the eonnterbore, there being a groove around the cap. and a tangent pin driven through the wall of the lock-ease and entering the groove, said pin fitting in an opening in the wall of the lock-ease and being confined by having the edges of said opening peened over there- 11. In a lock. :1 lock -ease having a bore opening at the front end thereof and a eounterbore at said front end. a lock barrel fitting in the bore. a cap fitting on the end of the lock barrel and contained within the counter-bore; there being a groovearound the cap. and stop pins projecting into the groove from the lock-ease and the cap reapeetivel v for limiting the movement of the lock barrel.

12. In a look. a lock-case. a lock barrel fitting thereinand provided with an integral projeetion on ita end forming an 0 al shaped eanL-a hard metal band surrounding the oval shaped cam and secured thereto, and a lock bolthaving a slot to receive the cam.

In testimony whereof. I atlix mv signature.

EDWARD N. JACQBI. 

